18QHTF21-74.350-PD

Overview

The 18QHTF21-74.350-PD is a standard crystal oscillator manufactured by Mercury Electronic Ind., Co., Ltd. It operates at a frequency of 74.350 MHz and utilizes LVCMOS output logic. The device is powered by a 1.8V supply voltage and features a Standby (Power Down) control function. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm.

Feature Summary

• Supports Low Voltage CMOS (LVCMOS) output logic for digital interfacing
• Includes Standby or Power Down functionality to manage power consumption
• Designed as a standard crystal oscillator for clock signal generation

Applications

• Digital clock signal distribution
• Microprocessor system timing
• Communication interface synchronization

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the official datasheet before procurement. Confirm that the 1.8V supply voltage aligns with the target circuit design. Ensure the 4-SMD No Lead package footprint matches the PCB layout constraints. Check for any specific RoHS compliance documentation if required by the project specifications.

Selection Notes

Select this component when a precise 74.350 MHz clock source is required for LVCMOS-compatible circuits. The choice is driven by the need for a low-profile 2.0x1.6mm package and integrated power-down capabilities. Consider the operating temperature range and stability requirements relative to the application environment.

Part Context

This part belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronics. The series offers various frequencies within a standardized small outline package format. The 'PD' suffix indicates the inclusion of a power-down pin or feature, distinguishing it from basic continuous-output variants.

Replacement Considerations

Direct substitutes must match the 74.350 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify equivalent electrical characteristics such as phase noise and jitter performance. Cross-reference with other manufacturers offering similar low-profile XO components.